我正在尝试实现一个简单的图片集展示，在设备屏幕上逐张显示图片。当我们从左往右滑动屏幕时，应该显示下一张图片。
为此，我实现了一个视图翻转器并将图像视图添加到其中。
但我不知道如何捕获滑动事件。
有人能给我一个示例吗？
如何滑动图片
14
- Vishal Arora
2
你为什么想要捕获那个滑动事件呢？ - Aman Alam
我想捕获那个滑动事件，这样根据滑动方向，我就可以从左往右或者从右往左改变图像。 - Vishal Arora
7个回答
17
我需要我的应用程序也实现同样的功能，使用了一个 ViewPager:
之前我使用了 ImageSwitcher 结合 GestureDetector 来实现：http://blog.sqisland.com/2012/07/android-swipe-image-viewer.html
使用 ViewPager 的代码更简单，而且体验更好，因为图片随着您的手指在屏幕上滑动而滑动。 我直接创建了 ImageView，无需使用片段。
- chiuki
1
5
您可以为ViewPager创建自定义Pager Adapter：
您可以为您的ViewPager创建一个自定义的Pager适配器：
您可以为您的ViewPager创建一个自定义的Pager适配器：
public class ImageAdapter extends PagerAdapter {
private Context context;
private int[] GalImages = new int[]{
R.drawable.cap8, R.drawable.cap2, R.drawable.cap3, R.drawable.cap1, R.drawable.cap5,
R.drawable.cap6, R.drawable.cap7, R.drawable.cap9, R.drawable.cap4,
R.drawable.cap10
};
ImageAdapter(Context context) {
this.context = context;
}
@Override
public int getCount() {
return GalImages.length;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
ImageView imageView = new ImageView(context);
int padding = context.getResources().getDimensionPixelSize(R.dimen.activity_horizontal_margin);
imageView.setPadding(padding, padding, padding, padding);
imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
imageView.setImageResource(GalImages[position]);
container.addView(imageView, 0);
return imageView;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((ImageView) object);
}
}
在您的布局中使用ViewPager并注册适配器：
<android.support.v4.view.ViewPager
android:id="@+id/mvieww"
android:layout_width="match_parent"
android:layout_height="match_parent" />
- Soni Kumar
4
您也可以这样做，而不使用视图翻转器。
活动类
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:gravity="center"
android:layout_margin="10dip"
android:id="@+id/image_place_holder"
/>
</RelativeLayout>
活动类
public class MainActivity extends Activity {
private Integer[] mImageIds = { R.drawable.img1, R.drawable.img2,R.drawable.img3 };
private static final String DEBUG_TAG = "MainActivity ";
ImageView imageView;
float startXValue = 1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.gallery);
imageView = (ImageView) findViewById(R.id.image_place_holder);
imageView.setImageResource(mImageIds[num]);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float endXValue = 0;
float x1 = event.getAxisValue(MotionEvent.AXIS_X);
int action = MotionEventCompat.getActionMasked(event);
switch (action) {
case (MotionEvent.ACTION_DOWN):
startXValue = event.getAxisValue(MotionEvent.AXIS_X);
return true;
case (MotionEvent.ACTION_UP):
endXValue = event.getAxisValue(MotionEvent.AXIS_X);
if (endXValue > startXValue) {
if (endXValue - startXValue > 100) {
System.out.println("Left-Right");
imageView.setImageResource(mImageIds[2]);
}
}else {
if (startXValue -endXValue> 100) {
System.out.println("Right-Left");
imageView.setImageResource(mImageIds[0]);
}
}
return true;
default:
return super.onTouchEvent(event);
}
}
}
- Suraj Kharwde
1
这是我如何实现的：
package com.demoimageslider;
import java.util.List;
import java.util.Vector;
import com.nineoldandroids.view.ViewHelper;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
public class MainActivity extends FragmentActivity {
private PagerAdapter mPagerAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.initialisePaging();
}
private void initialisePaging() {
List<Fragment> fragments = new Vector<Fragment>();
fragments.add(Fragment.instantiate(this, Tab1Fragment.class.getName()));
fragments.add(Fragment.instantiate(this, Tab2Fragment.class.getName()));
fragments.add(Fragment.instantiate(this, Tab3Fragment.class.getName()));
this.mPagerAdapter = new PagerAdapter(
super.getSupportFragmentManager(), fragments);
ViewPager pager = (ViewPager) super.findViewById(R.id.pager);
pager.setAdapter(this.mPagerAdapter);
pager.setPageTransformer(true, new ZoomOutPageTransformer());
}
public static class Tab1Fragment extends Fragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (container == null) {
return null;
}
return (ImageView) inflater.inflate(R.layout.tab_frag1_layout,
container, false);
}
}
public static class Tab2Fragment extends Fragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (container == null) {
return null;
}
return (ImageView) inflater.inflate(R.layout.tab_frag2_layout,
container, false);
}
}
public static class Tab3Fragment extends Fragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (container == null) {
return null;
}
return (ImageView) inflater.inflate(R.layout.tab_frag3_layout,
container, false);
}
}
public static class PagerAdapter extends FragmentPagerAdapter {
private List<Fragment> fragments;
public PagerAdapter(FragmentManager fm, List<Fragment> fragments) {
super(fm);
this.fragments = fragments;
}
@Override
public Fragment getItem(int position) {
return this.fragments.get(position);
}
@Override
public int getCount() {
return this.fragments.size();
}
}
public static class ZoomOutPageTransformer implements
ViewPager.PageTransformer {
private static final float MIN_SCALE = 0.85f;
private static final float MIN_ALPHA = 0.5f;
public void transformPage(View view, float position) {
int pageWidth = view.getWidth();
int pageHeight = view.getHeight();
if (position < -1) { // [-Infinity,-1)
// This page is way off-screen to the left.
// view.setAlpha(0);
ViewHelper.setAlpha(view, 0);
} else if (position <= 1) { // [-1,1]
// Modify the default slide transition to shrink the page as
// well
float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position));
float vertMargin = pageHeight * (1 - scaleFactor) / 2;
float horzMargin = pageWidth * (1 - scaleFactor) / 2;
if (position < 0) {
// view.setTranslationX(horzMargin - vertMargin / 2);
ViewHelper.setTranslationX(view, horzMargin - vertMargin
/ 2);
} else {
// view.setTranslationX(-horzMargin + vertMargin / 2);
ViewHelper.setTranslationX(view, -horzMargin + vertMargin
/ 2);
}
// Scale the page down (between MIN_SCALE and 1)
// view.setScaleX(scaleFactor);
// view.setScaleY(scaleFactor);
ViewHelper.setScaleX(view, scaleFactor);
ViewHelper.setScaleY(view, scaleFactor);
// Fade the page relative to its size.
// view.setAlpha(MIN_ALPHA +
// (scaleFactor - MIN_SCALE) /
// (1 - MIN_SCALE) * (1 - MIN_ALPHA));
ViewHelper.setAlpha(view, MIN_ALPHA + (scaleFactor - MIN_SCALE)
/ (1 - MIN_SCALE) * (1 - MIN_ALPHA));
} else { // (1,+Infinity]
// This page is way off-screen to the right.
// view.setAlpha(0);
ViewHelper.setAlpha(view, 0);
}
}
}
}
我使用了NineOldRoids库来支持在旧的Android版本上实现特效。
- Chintan Soni
1
您想使用Android Support Jar中提供的ViewPager。这里有一个教程：http://thepseudocoder.wordpress.com/2011/10/05/android-page-swiping-using-viewpager/
您不想像一些人建议的那样使用Gallery，因为它已经过时了。然而，从文档中他们建议使用ViewPager和HorizantleScrollView相对容易地解决这个问题：
This class is deprecated.
This widget is no longer supported. Other horizontally scrolling widgets include
HorizontalScrollView and ViewPager from the support library.
- Salil Pandit
1
在某些情况下，IMO ViewPager 不是最合适的选择。它通常与片段相关联，如果您只想使用单独的片段滑动图像，那么每次滑动都需要一个新的片段似乎有些过度设计了。 - Jose_GD
1
你可以这样做，它肯定可以在没有任何视图的情况下工作。
在你的 .java 文件中声明这个方法。
public class Swipe extends Activity implements OnClickListener {
private static final int SWIPE_MIN_DISTANCE = 120;
//private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
final GestureDetector gdt = new GestureDetector(new GestureListener());
private GestureDetector gestureDetector;
ImageView img;
View.OnTouchListener gestureListener;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.swipe);
img = (ImageView)findViewById(R.id.imageView1swipe);
img.setOnTouchListener(new OnTouchListener() {
public boolean onTouch(final View view, final MotionEvent event) {
// TODO Auto-generated method stub
gdt.onTouchEvent(event);
//Log.i("Hello my Log 1","How dfgfd are you");
return true;
}
});
在你的 .java 文件中声明这个方法。
private class GestureListener extends SimpleOnGestureListener {
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
Log.i("Hello my Log 2","How dfgfd are you");
if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
Log.i("dfsd", "Right to left");
return false; // Right to left
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
return false; // Left to right
}
if (e1.getY() - e2.getY() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityY) > SWIPE_THRESHOLD_VELOCITY) {
return false; // Bottom to top
} else if (e2.getY() - e1.getY() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityY) > SWIPE_THRESHOLD_VELOCITY) {
return false; // Top to bottom
}
return false;
}'
也许this能帮助您安排所有图片的滑动。
- Kirtikumar A.
1
请注意，您应该在此网站上发布答案的有用要点，否则您的帖子可能会被删除请参阅FAQ中提到的“几乎只是链接”的答案。如果您愿意，仍然可以包含链接，但仅作为“参考”。答案应该独立存在，不需要链接。 - Andrew Barber
0
你为什么不使用图库小部件来实现它呢？
- N-JOY
1
相册已经过时了 :( http://developer.android.com/reference/android/widget/Gallery.html - Salil Pandit
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